Building Multi-Color Indicators with MQL5 Buffers
Summary
The article explains how MQL5 indicators use data buffers and color-index buffers to assign different colors to individual plotted values. It distinguishes the number of plots from the number of buffers, describes static and dynamic color configuration, and shows how a simple price condition can select a color for each bar. The same buffer concepts support converting a standard RSI line into a color line and coloring candles according to RSI readings.
It also explains how to retrieve a color index from an indicator buffer, provided the reader knows which buffer stores the indexes and how indexes correspond to colors. The examples are implementation guidance rather than trading research: the document gives no performance evidence or evaluation of whether color-based displays improve decisions. Its focus is MQL5 visualization and indicator integration, and readers must verify buffer ordering and color mappings for their own indicators.
Key ideas
- MQL5 color plots use a data buffer together with a buffer that stores a color index for each plotted element.
- The number of buffers required depends on the drawing style, while the number of plots describes the displayed graphics.
- Colors can be assigned at compile time or changed dynamically, with dynamic settings taking precedence when both are used.
- A color index can be selected from a rule such as comparing a bar’s opening and closing prices.
- An EA or script can read color indexes from the indicator buffer when it knows the buffer and index-to-color mapping.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.